Aye, and if you want to randomize their rotation, but not have them skew all over like crazy, Vulcan... Do your Randomize, then click the little "A" for Attributes, then change the X and Z rotations to Zero. Leave the Y alone, and you'll have random rotations! Woo hoo! If you want to "plant" them on a terrains, do all the above, an position the whole bunch over your terrain. Slide them UP (Y-axis) a bit, then click the drop-down arrow, or "Drop to Terrain". Now, move them all DOWN (Y-axis) only a bit, to hide the roots. Nothing screams "Newbie" like too-visible roots in Bryce... (For Treelab trees, anyway)